Sound Devices USBPre 2 drivers for windows

["Gianni Pavan" gianni_pavan]

dear all,
       when it was released, the SD USBPre 2 was not usable in Windows at
samples higher than 48k. Now, the new ASIO drivers released by SoundDevices
also provide WDM compatibility and can be used by any WDM compliant softwar=
e
at any of the sampling rates supported by the USBPre (tested on Windows 7 6=
4
bit, not tested yet on XP).
Of course, any feedback from other users is welcome!

In my very preliminary tests at 192k I can say that the USBPre has a flat
frequency extension up to 90kHz with an a-a filter not very sharp but enoug=
h
for most bioacoustic needs. The preamplifier noise is very low and the
increase of the noise floor above 50-60 kHz is much lower than other
devices.

Here some preliminary measures of aliasing....
INPUT at 0dB                            ALIAS
102kHz                                    -10dB at 90kHz
112kHz                                    -27dB at 80kHz
122kHz                                    -55dB at 70kHz

More accurate tests will follow, including the EMU TrackerPre. Results will
be published soon on our website at
http://www.unipv.it/cibra/res_techtest_uk.html

Gianni